Radio static-eliminating apparatus



Jan. 8, 1929.

J. E. TURNER RADIO sTATc ELIMINATING APPARATUS Filed Jan. l0, 1927INVENTOR. /l/Vz'M/s/a/ .rfllllllfllinll Intuit.

Patented Jan. 8,1929. l p Y A I Y 'p i UNITEDXSTTELS] PATENT y JQsEPH E.TURNER, or MANITOU, eenonnno.

`mimo straTIe.-ELnrunnrrrerV APPARATUS.

.eppnaeion ined January 10, i927. serial No. 160,143. y

My invention relates to radio static eliminating apparatus. n

The object of my invention is toprovide a novel apparatus .forconducting static re- 6 ceived with radio signalsto groundbefore thestatic reaches a receiving set, while permitting radio signals te. enterthe set. l

My invention provides further novel'static eliminating means of the kinddescribed, 70 having` means for connection to ground, to

an aerial conductor and to the intake termichicles a container 1, which,for example,-

may be cylindrical and have a height of six inches and a diameter offour inches, and which may be provided at its upper end with a cover 2,having mounted therein three terminals 3, 4 and'5, whichv are insulatedfrom each other.

The terminal 3 isadapted to be connected to an aerial wire 6. Theterminal 5 is adapted to be connected by a wire 7 to the intake terminal8 of a receiving set, Fig. r3.

The receiving set has the usual terminal 9 connected by a wire 10 toground.

A U-shaped conductor 11 in the container 1 has its ends respectivelyconnected to the terminals 3 and 5. p

A wire 12 connects the terminal 4 to ground independently of thegrounding of the set by the wire 10.

For diverting the static received withthe signals, conductive' means`having relatively large area 1s provided 1n the container 1, and

may consist in a vertical conductive plate 13 15, interwoven through`holes 1.6' inv the plate, as shown, to assure Ya goed Vcomiectionbetween the v)late 13 and wirel.' i

The conductor 11 may be disposed in a tube 17, which may be softrubber,the ends used, it vmay have mixed with vift a small amount of salt andmuriatic acid in solution. Plaster of Paris 2,0 covers the material 19.

The salt and acid serve to malte a goed electrical lconnection betweenthe charcoal and the plate 13, lwhereby the charcoal as sists the plate13. te collect and divert the static, which to a large extent is carriedto ground through the Wires 15 and 12 and terminal 4, the amount ofstatic passing to the set being insulicientto interfere with theclearness of the radio signais received by the set through the conductor11, terminals 3 and 5 and Wire 7. The volume of such'radio signals, withgood reception and t a good set, is of suiicient strength to afford goodaudibility, and the signals are very clear.

Any good receiving set may be employed, which has a usual tuningelement, such as a ltuning coil 21. One terminal of the coil 21 isconnected to the intake terminal 8, Fig. 3. The grid 22 of a detectortube 35 is connected to a conductor 23 which has a contact 24 slidablyengaging, in the usual manneigthe windings of the coil 21. The plate 25of the detector tube 35 is connected by a conductor 26 with one terminalof a head set 27, the other terminal of which connected by a conductor28 to the positive pole of a B battery'29. The negative terminal of thebattery 29 is connected by a conductor 30 with onel terminal of thefilament 31 of the detectortube 35. The other terminal of the ilament 31is connected to. the positive pole of an A battery 32 by a conductor 33.The negative pokle of the battery 32 is connected by a conductor 34 to.the conductor 30.

In the use of the invention, the separate vground connection, for theplate 13 is essential inthe proper functioning of the device,` and theset should be Connected toa good aerial, :to offset the loss ofsuchradio signals as seek the ground through the Wire 12, instead ofentering the set.

The metal container 1 Vmay be insulated from the charcoal 19 by aninsulatingcoat-l in g' of any suitable material, such as enamel, or it`may be `coated with pitch to keep the aeidand salt from attacking themetal", or the `container itself be oi' insulating material, suoli` ashard rubber. Aeide, however, "fromtlie Chemical action which 'may` takeplace and "deteriorate t l l of metal, itis not neeeseary t0 insulatethe ne container, if

container, as, like tlieeliarcoal andv plate 13,

it serves, "when in eleetriofconnection fwith ther plate `13, throughthe `charcoal 197 to assist the plate `13 in diverting', collerting andcarrymgiof static.`

r`The `plate 13 ma be tive material, suoi Copper-,j` Silver-,Doraluminum; It should have relatively .large area,` ae shown, and may beflat,` as shown,

or any other desired eonliguration.

With the use of my invention, I have had wonderfully Vclear reception attimes. and under conditions which made the signals givenbut by the sletunintelligible, when `the eliminating device `described was i notY .usedin connection With the set.`

I do notlimit my-invention tov the speL eifiog features of constructionshown and described, as `many modieations, Within the scopeof theappendedelaims, may be milde andytothe intake terminal of a receivingset, a oonductorin said Container 'Connecting saidtivoinsulatedterminals; Vthe third of Said terminals being adapted to beoonneeted with ground, etaticilcolleotingmeans Without departing,froiii"\the `epirit of any of relative :larger area and capaeity'insaid `i i Container connected to` said thirdgterminal 5()`V l and to`said Connecting conductorfand eonjduetive paeking material insai'dcontainer in 'which said colleetingmeans 1s embedded.) Vf 2; In a .radiostatioeliminating apparatus, a oontainerrhaving .threeterminalsfinQ`leulated from each other, two of which are adapted to be respectively`Connected to an aerial Conductor and to the intaketerminal of areceiving set, the third terminal being adaptedto beconnected to ground,ai oon-v duct-or in saidjcontainerhaving ite arms ree spectivelyconnected to `said two terminals,

a Conductive plate of relatively largezarea `dispoeed betweenand'conneo'ted to the arms of said `conductor and connected to saidthird insulated ilterminal, and conductive? packing material'in saidcontainer in which saidplate is embedded.` Y i l` Inlteetimony whereof Ihave signed my name torthis specification.`

JOSEPH TURNER. i

